The effect of biotic and physical factors on the competitive ability of Rhizobium leguminosarum

Wielbo, Jerzy; Kidaj, Dominika; Koper, Piotr; Kubik-Komar, Agnieszka; Skorupska, Anna

doi:10.2478/s11535-011-0085-x

Cited by 8 publications

(14 citation statements)

References 63 publications

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“…The significance of all of the aforementioned factors, as well potentially unidentified traits, in rhizobial competitiveness can vary from high to negligible [90]. Nevertheless, they all simultaneously affect bacterial communities.…”

Section: Changes In Rhizobial Populations Resulting From Competition mentioning

confidence: 99%

“…Total global BNF is estimated at 100-300 Tg N per annum, and the amount of N 2 derived from rhizobial-legume symbioses Tg N per annum) is comparable with the total amount of N fixed industrially in fertilizer production (80)(81)(82)(83)(84)(85)(86)(87)(88)(89)(90) Tg N per annum) [1,2]. Even though crop, pasture and wild legumes assimilate and accumulate BNF-derived nitrogen to differing levels [3], in most cases, symbiotically reduced N 2 covers more than half of total nitrogen requirements of a plant [2,4].…”

Section: Rhizobia and Their Role In Biological Nitrogen Fixationmentioning

confidence: 99%

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Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Wielbo

2012

Open Life Sciences

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AbstractThe term ‘Rhizobium-legume symbiosis’ refers to numerous plant-bacterial interrelationships. Typically, from an evolutionary perspective, these symbioses can be considered as species-to-species interactions, however, such plant-bacterial symbiosis may also be viewed as a low-scale environmental interplay between individual plants and the local microbial population. Rhizobium-legume interactions are therefore highly important in terms of microbial diversity and environmental adaptation thereby shaping the evolution of plant-bacterial symbiotic systems. Herein, the mechanisms underlying and modulating the diversity of rhizobial populations are presented. The roles of several factors impacting successful persistence of strains in rhizobial populations are discussed, shedding light on the complexity of rhizobial-legume interactions.

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Section: Changes In Rhizobial Populations Resulting From Competition mentioning

confidence: 99%

Section: Rhizobia and Their Role In Biological Nitrogen Fixationmentioning

confidence: 99%

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Wielbo

2012

Open Life Sciences

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“…However, few numbers of tested rhizobia found effective at Fedis site could be associated with the presence of competitive and high rhizobia population nodulating peanut in the experimental soil. Similarly, Wielbo et al (2012) highlighted that soil type and the host plant identity influenced the competitiveness of rhizobia. Competitive ability of rhizobia strains also determined by the metabolic potential in utilizing a diversity carbon and energy sources of tested isolates and the responsiveness of nod genes to flavonoid activation (Wielbo et al 2007;Maj et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Development of environmental friendly bioinoculate for peanut (Arachis hypogea L.) production in Eastern Ethiopia

Argaw

2017

Environ Syst Res

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Background: Bacterial bioinoculate is one of environmentally friendly input for crop production. Several works revealed that effectiveness of Rhizobium bioinoculant have been affected by the native rhizobia population. Hence, this study was initiated to evaluate the effect of selected Bradyrhizobium in nodulating peanut in the major growing areas of Ethiopia. Methods:The effect of eight effective Bradyrhziobium vis-a-vis 20 kg N ha −1 and the control check on the nodulation and yield of two peanut cultivars (Sedi and Werer 942) at Babile and Fedis, eastern Ethiopia, during 2013 cropping season was evaluated. Results:The results showed that the inoculation, location and cultivar and their two and three ways interaction had a significant influence on the nodulation and grain yield. Inoculation of Bradyrhizobium increased the nodule number, nodule dry weight, number of seeds per plants, total pods weight, hundred seeds weight, total biomass yield, grain yield and shelling % up to 37, 24.9, 22.4, 22.5, 5.5, 26.2, 35.8 and 24.1%, respectively. Isolate HUGNR-29 was found to be more effective as it scored the highest nodule dry weight and grain yield. Application of inorganic N increased the yield and yield components of peanut in either of locations. Though the statistically better effective nodule % was recorded at Babile, significantly higher nodule number, nodule dry weight, and total N accumulation were obtained from Fedis than Babile site. Significantly higher total pods weight, hundred seeds weight, total biomass weight, grain yield and total plant N accumulation was recorded with the cultivar werer-962 than those produced with Bati-Sedi. Conclusions:The result showed that Bradyrhizobium inoculation is essential to improve the peanut production through environmentally and economically sustainable ways though the soil native rhizobia nodulating peanut was high. Peanut cultivar and study site based rhizobia inoculant development is also important.

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“…; Wielbo et al . ); (ii) environmental heterogeneity may be important if strain fitness depends on G × E (genotype by environment) or G × G × E interactions (Thies, Bohlool & Singleton ); and (iii) host specialization if symbiotic effectiveness varies depending on the host with which a rhizobium associates (i.e. G × G variation; e.g.…”

Section: Introductionmentioning

confidence: 99%

Host species and environmental variation can influence rhizobial community composition

2016

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Summary Nitrogen‐fixing rhizobial mutualists display high levels of genetic and phenotypic diversity at multiple spatial scales. Identifying the ecological and environmental drivers of variation in the genetic composition and function of rhizobial communities is critical to understanding rhizobial impacts on community and ecosystem productivity. In this study, we examined how environmental factors and host species jointly affect rhizobial phenotypic diversity and community structure. Individual host plants of two native Australian legumes, Acacia salicina and A. stenophylla, were inoculated with a community of six rhizobial strains (belonging to three genera) previously characterized for symbiotic effectiveness. The plants were grown in a fully factorial experiment under high and low phosphorus and water, and high or no nitrogen. Half the plants were harvested after 19 weeks and the other half after 30 weeks. The relative abundance of the six rhizobial strains was characterized using amplicon sequencing of the rhizobial 16S rRNA gene from DNA extracted from the root nodules of plants after each harvest. Variation in the relative abundance of the six rhizobial strains was best explained by host species, although interactions between environment and host species also emerged as significant predictors of variation in rhizobial community composition. We detected strong host‐specific interactions for two strains, while two other strains were clearly generalists, being relatively abundant in both host species. For both host species, the two generalist strains were as abundant as the best specialist strain within the rhizobial community. Synthesis. Our study show host species identity as the key determinant of rhizobial community structure within the root nodules of Acacia plants. Strains that were efficient at promoting the growth of their host plant had high relative abundance in experimental communities. Furthermore, interaction among host species, rhizobial host‐range, and environmental variation determine the structure of rhizobial communities, although not in clearly predictable ways. Such interactions contributed to the maintenance (albeit at relatively low frequencies) of ineffective strains in nodule communities. These interacting effects could help to explain why rhizobial communities are functionally diverse, such that specialists, generalists and seemingly ineffective rhizobia, can be simultaneously maintained in rhizosphere communities.

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The effect of biotic and physical factors on the competitive ability of Rhizobium leguminosarum

Abstract: Abstract

Cited by 8 publications

References 63 publications

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Development of environmental friendly bioinoculate for peanut (Arachis hypogea L.) production in Eastern Ethiopia

Host species and environmental variation can influence rhizobial community composition

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